# How do you find the difference between two timestamps in Unix?

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## How do you find the difference between two timestamps?

If you’d like to calculate the difference between the timestamps in seconds, multiply the decimal difference in days by the number of seconds in a day, which equals 24 * 60 * 60 = 86400 , or the product of the number of hours in a day, the number of minutes in an hour, and the number of seconds in a minute.

## How do I subtract two timestamps in Linux?

If you want to process the date using simple command line tools, you need to convert the timestamps into some easy-to-deal-with format, like epoch-based. Then you can subtract to get a number of milliseconds representing the diff.

## How do I find the difference between two times in Linux?

6 Answers. Really simple, take the number of seconds at the start, then take the number of seconds at the end, and print the difference in minutes:seconds.

## What timestamp format is this?

Automated Timestamp Parsing

Timestamp Format Example
yyyy-MM-dd*HH:mm:ss 2017-07-04*13:23:55
yy-MM-dd HH:mm:ss,SSS ZZZZ 11-02-11 16:47:35,985 +0000
yy-MM-dd HH:mm:ss,SSS 10-06-26 02:31:29,573
yy-MM-dd HH:mm:ss 10-04-19 12:00:17

## Is epoch time same everywhere?

Getting back to the question, Epoch time doesn’t technically have a timezone. It is based on a particular point in time, which just so happens to line up to an “even” UTC time (at the exact beginning of a year and a decade, etc.).

## How do I find the difference between two dates and minutes in SQL?

DATEDIFF() is a basic SQL Server function that can be used to do date math. Specifically, it gets the difference between 2 dates with the results returned in date units specified as years, months days, minutes, seconds as an int (integer) value.

## How do I find the difference in time between two columns in SQL?

To calculate the difference between two dates in the same column, we use the createdDate column of the registration table and apply the DATEDIFF function on that column. To find the difference between two dates in the same column, we need two dates from the same column.

## How do I find the difference between two dates and seconds in SQL?

To calculate the difference between the arrival and the departure in T-SQL, use the DATEDIFF(datepart, startdate, enddate) function. The datepart argument can be microsecond , second , minute , hour , day , week , month , quarter , or year . Here, you’d like to get the difference in seconds, so choose second.

## How do you display current day as full weekday in Unix?

From the date command man page:

1. %a – Displays the locale’s abbreviated weekday name.
2. %A – Displays the locale’s full weekday name.
3. %b – Displays the locale’s abbreviated month name.
4. %B – Displays the locale’s full month name.
5. %c – Displays the locale’s appropriate date and time representation (default).

## How does shell script calculate time difference?

An integer value of elapsed seconds:

1. Bash variable SECONDS (if SECONDS is unset it loses its special property). …
2. Bash printf option %(datefmt)T : a=”\$(TZ=UTC0 printf ‘%(%s)Tn’ ‘-1’)” ### `-1` is the current time sleep 1 ### Process to execute elapsedseconds=\$(( \$(TZ=UTC0 printf ‘%(%s)Tn’ ‘-1’) – a ))

## How does shell script calculate elapsed time?

Measure elapsed time internally in a script

1. START_TIME=\$(date +%s)
2. sleep 1 # put some real task here instead of sleeping.
3. END_TIME=\$(date +%s)
4. echo “It took \$((\$END_TIME – \$START_TIME)) seconds to sleep of 1 second…”